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Q.

Electronic configuration of  germanium  is  2, 8,  18 and 4.  To make it extrinsic semiconductor small quantity of antimony  is added.

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a

The material obtained will be N-type germanium in which electrons and holes are equal in number.

b

The material obtained will be P-type germanium.

c

The material obtained will be N-type germanium which has more electrons than holes at room temperature.

d

The material obtained will be N-type germanium which has less electrons than holes at room temperature.

answer is C.

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Detailed Solution

Antimony is a fifth group impurity and is therefore a donor of electrons.
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Electronic configuration of  germanium  is  2, 8,  18 and 4.  To make it extrinsic semiconductor small quantity of antimony  is added.